This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...minimum, about T = 60,000 4-70,000 C Tm = 4,218 + 4,921 C where T is the tenacity in pounds per square inch, and Tm in kilogrammes on the square centimetre; C is the percentage of carbon. For annealed samples f of good ingot iron and steel, T-50,000 + 60,000 C Ta = 3,515 + 4,218 C Thus, as illustrating these cases, the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...minimum, about T = 60,000 4-70,000 C Tm = 4,218 + 4,921 C where T is the tenacity in pounds per square inch, and Tm in kilogrammes on the square centimetre; C is the percentage of carbon. For annealed samples f of good ingot iron and steel, T-50,000 + 60,000 C Ta = 3,515 + 4,218 C Thus, as illustrating these cases, the Author has found the following figures by test: Trans. Amer. Soc. C. E., 1874. t Structures in Iron and Steel; Weyrauch, translated by Dubois: N. Y., 1877. The Author would adopt the above formulas to determine values to be inserted in specifications. Bauschinger, experimenting upon Ternitz Bessemer steel, deduced the following: Tm = 4.35o (1 + C) ) i. e. T-61,870 (1 + C)) which equation expresses the results of his tests with great accuracy. American steels are seen to be slightly stronger than the European. Weyrauch gives as a minimum set of values, such as may be used as a basis for specifications: Tm = 3,700 (1 + C) i. e., T = 52,625 (t + C) j which formula is probably also sufficiently exact as expressing the strength of good, pure iron and steel containing no appreciable quantity of the hardening elements other than carbon. For C = o, T = 52,625 pounds per square inch "Versuche uebcr die Fcstijjkeit des Bessemerstahls," etc (3,700 kilogrammes per square centimetre), which is a usual figure for good bridge, cable, and blacksmith's iron of about 2 inches (5.08 centimetres) diameter. As a general rule, the Elongations of Steel of the finest grades are diminished as the tenacity increases, and in steels tested for Trautwine this reduction is nearly proportional to the increase in strength. Calling the shock-resisting power of the piece--or, more correctly, its work of resistance--equal to two-thirds the product of the ultimate res...
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